[nuconvert]

‘chav’ and ‘numpty’ are 2 I haven’t heard at all

[the scotsman]

Both very popular (in the former case, Scots use ‘ned’ or ‘neds’) and numpty or numptie is very popular.

I use both myself.

[cunning_fish]

“chav” is actually a British term for “white trash” or urban hick.